For those looking for a D700 replacement (who didn't find it in D800) take a look at what Nikon as done with the FX lineup:
D3 ... D700/D3 ... D700/D3s/D3x ... D600/D800/D4
What started with a revolutionary camera, dovetailed into 2 cameras sharing tech and therefore pretty close in many aspects. That eventually morphs into today's lineup where the feature/performance lines are pretty clean cut and well diversified (and in the case of D800/D4, highly targeted).
I imagine Nikon would feel much more comfortable with the current lineup. There's enough diversification that it seems unlikely one would cannibalize the other, and it seems well designed to target specific market segments.
Of course, what's missing is the D4 sensor in a D800-like body, which is what many D700 users want. I believe Nikon is saying to those users, buy a D4 if that's what you want. I'm not sure there's room for that (or for a D600 sensor in a D800 body) in the lineup, given that either of these would have to fit between the $2100 and $3000 price points, and those already seem a little close to each other.